Human immunodeficiency virus (HIV) is a virus that attacks the immune system by infecting and killing white blood cells known as CD4+ T-cells. CD4+ T-cells represent a vital part of the immune system and untreated HIV infections render patients more vulnerable to dangerous infections by other pathogens, including bacteria and fungi. If the virus remains untreated it can lead to patients developing the life-threatening disease acquired immunodeficiency syndrome (AIDS). Untreated HIV can leave people vulnerable to life-threatening infections. HIV symptoms often manifest as flu-like symptoms such as fever, chills, rash, night sweats, muscle aches, sore throat, and fatigue. Today, antiviral medications can allow people living with HIV to live healthy lives.